2009-2014 Cadillac CTS-V Performance Mods Discussion, Heel Toe in Cadillac CTS-V Series Forum - 2009-2014; I'm reading the owners manual, and it specifically says, DO NOT REV ENGINE WHEN DOWNSHIFTING.
Why wouldn't they want the ...
Heal / toe is the only way to drive a manual when pushing it otherwise the torque of the engine may make it an unpleasant experience when downshifting. I believe the problem is when inexperienced drivers try to rev match at low RPM's as this may put some undue stress on the drivetrain.
I don't see that in the 2013 manual. But in section 9 "Driving and Operating" it says
Notice: If you skip more than one gear when you downshift, or if you race the engine when you release the clutch pedal while downshifting, you could damage the engine, clutch, driveshaft or the transmission. Do not skip gears or race the engine when downshifting.
In other words, "if you do it wrong and you break something, don't come crying to us."
They teach heel-toe at the Cadillac V-Series Academy.